CVE-2026-99088: Linux kernel · net: openvswitch: validate transport header presence in set_ipv6_addr
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 29 Oct 2026, 01:00 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to return early in update_ipv6_checksum() when processing IPv6 fragments, preventing the warning caused by uninitialized transport header access. Users should apply the updated kernel versions that include this fix. No additional mitigation is required as the issue is harmless and only triggers debug warnings.
Description
A Linux kernel vulnerability in the Open vSwitch component was fixed by validating the presence of the transport header in the set_ipv6_addr function. The issue occurs when processing IPv6 fragments, where an uninitialized transport header pointer leads to a debug warning under CONFIG_DEBUG_NET=y. This warning is harmless but indicates improper handling of IPv6 fragment packets in checksum calculation.
References
- ubuntu.com/security/CVE-2026-99088 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99088 (opens in a new tab)
- git.kernel.org/stable/c/6b8897ba0733f88f0360ea48a970f373f9142de0 (opens in a new tab)
- git.kernel.org/stable/c/2594795fd832f0253826d64ff8976b8ff5fbfe9f (opens in a new tab)
- git.kernel.org/stable/c/b7b80d204abdc258006f9e17c92b363ab13bb599 (opens in a new tab)
- git.kernel.org/stable/c/6774af7cd17be8f0d0f70de3a749d381b4f2e9da (opens in a new tab)
- git.kernel.org/stable/c/3c6a4b11330fe424557538a98fca9f0a4c5bf313 (opens in a new tab)